Routing information Protocol (RIP) in Cisco Router

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Welcome to our website weindians.in and today we are going to discuss about network RIP Protocol (Routing information Protocol)

Distance: How far away the distance is from the source means it keep record of the hop count.

Vector: Which directions, in routing word we are about which interface and the IP-address of the next router it send it to.

Distance vector routing is also referred as ROUTING BY RUMOUR.

RIP is application layer protocol and it uses UDP PORT No – 520
RIP uses concept of update to share their routing table to the neighboring routers and these updates are periodic in nature.
RIP versions:
RIPV1: send update on broadcast address i.e 255.255.255.255
RIPV2: send updates on multicast address i.e 224.0.0.9
RIPng: RIP next generation.
RIP is a classless routing protocol by default means RIP don’t carry subnet mask with their routing updates.
RIP supports maximum15 hop counts.
AD value of RIP = 120.
Metric in RIP = hop Count.
RIP uses the bellman-Ford Distance Vector algorithm to determine the best “path” to a particular destination.

RIP Timers:

RIP Loop Avoidance Mechanism:

Split-Horizon: It states that if a router receives any update from an interface, then it will not send the same update from that particular interface, in order to prevent loops in the topology. Split-horizon is enable by default on cisco Routers.
Rote- Poisoning – whenever, a network goes down on a router, then an update is sent out of all the interface with an infinity metric for that network. Metric=16 in RIP indicates that the route goes down.
Hold-Down Timer: Prevent RIP from accepting any new updates for router in a hold-down state, until the hold-down timer expires.

Drawbacks of RIP:

It is not a scalable protocol.
Slow convergence.
It sends periodic update after every 30 sec which result in consumption of link bandwidth.
Pin-hole congestion.

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